/*
 * Copyright (c) 2001-2004 Caucho Technology, Inc.  All rights reserved.
 *
 * The Apache Software License, Version 1.1
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Caucho Technology (http://www.caucho.com/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "Burlap", "Resin", and "Caucho" must not be used to
 *    endorse or promote products derived from this software without prior
 *    written permission. For written permission, please contact
 *    info@caucho.com.
 *
 * 5. Products derived from this software may not be called "Resin"
 *    nor may "Resin" appear in their names without prior written
 *    permission of Caucho Technology.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL CAUCHO TECHNOLOGY OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @author Scott Ferguson
 */
package net.hasor.libs.com.caucho.hessian.io;
import java.io.IOException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
/**
 * Serializing an object for known object types.
 */
@SuppressWarnings({ "unused" })
public class BeanSerializer extends AbstractSerializer {
    private static final Object[] NULL_ARGS = new Object[0];
    private Method[]              _methods;
    private String[]              _names;
    private Object                _writeReplaceFactory;
    private Method                _writeReplace;
    public BeanSerializer(Class<?> cl, ClassLoader loader) {
        introspectWriteReplace(cl, loader);
        ArrayList<Method> primitiveMethods = new ArrayList<Method>();
        ArrayList<Method> compoundMethods = new ArrayList<Method>();
        for (; cl != null; cl = cl.getSuperclass()) {
            Method[] methods = cl.getDeclaredMethods();
            for (int i = 0; i < methods.length; i++) {
                Method method = methods[i];
                if (Modifier.isStatic(method.getModifiers()))
                    continue;
                if (method.getParameterTypes().length != 0)
                    continue;
                String name = method.getName();
                if (!name.startsWith("get"))
                    continue;
                Class<?> type = method.getReturnType();
                if (type.equals(void.class))
                    continue;
                if (findSetter(methods, name, type) == null)
                    continue;
                // XXX: could parameterize the handler to only deal with public
                method.setAccessible(true);
                if (type.isPrimitive() || type.getName().startsWith("java.lang.") && !type.equals(Object.class))
                    primitiveMethods.add(method);
                else
                    compoundMethods.add(method);
            }
        }
        ArrayList<Method> methodList = new ArrayList<Method>();
        methodList.addAll(primitiveMethods);
        methodList.addAll(compoundMethods);
        Collections.sort(methodList, new MethodNameCmp());
        _methods = new Method[methodList.size()];
        methodList.toArray(_methods);
        _names = new String[_methods.length];
        for (int i = 0; i < _methods.length; i++) {
            String name = _methods[i].getName();
            name = name.substring(3);
            int j = 0;
            for (; j < name.length() && Character.isUpperCase(name.charAt(j)); j++) {}
            if (j == 1)
                name = name.substring(0, j).toLowerCase() + name.substring(j);
            else if (j > 1)
                name = name.substring(0, j - 1).toLowerCase() + name.substring(j - 1);
            _names[i] = name;
        }
    }
    private void introspectWriteReplace(Class<?> cl, ClassLoader loader) {
        try {
            String className = cl.getName() + "HessianSerializer";
            Class<?> serializerClass = Class.forName(className, false, loader);
            Object serializerObject = serializerClass.newInstance();
            Method writeReplace = getWriteReplace(serializerClass, cl);
            if (writeReplace != null) {
                _writeReplaceFactory = serializerObject;
                _writeReplace = writeReplace;
                return;
            }
        } catch (ClassNotFoundException e) {
            //
        } catch (Exception e) {
            log.debug(e.toString(), e);
        }
        _writeReplace = getWriteReplace(cl);
    }
    /**
     * Returns the writeReplace method
     */
    protected Method getWriteReplace(Class<?> cl) {
        for (; cl != null; cl = cl.getSuperclass()) {
            Method[] methods = cl.getDeclaredMethods();
            for (int i = 0; i < methods.length; i++) {
                Method method = methods[i];
                if (method.getName().equals("writeReplace") && method.getParameterTypes().length == 0)
                    return method;
            }
        }
        return null;
    }
    /**
     * Returns the writeReplace method
     */
    protected Method getWriteReplace(Class<?> cl, Class<?> param) {
        for (; cl != null; cl = cl.getSuperclass()) {
            for (Method method : cl.getDeclaredMethods()) {
                if (method.getName().equals("writeReplace") && method.getParameterTypes().length == 1 && param.equals(method.getParameterTypes()[0]))
                    return method;
            }
        }
        return null;
    }
    public void writeObject(Object obj, AbstractHessianOutput out) throws IOException {
        if (out.addRef(obj))
            return;
        Class<?> cl = obj.getClass();
        try {
            if (_writeReplace != null) {
                Object repl;
                if (_writeReplaceFactory != null)
                    repl = _writeReplace.invoke(_writeReplaceFactory, obj);
                else
                    repl = _writeReplace.invoke(obj);
                // out.removeRef(obj);
                out.writeObject(repl);
                out.replaceRef(repl, obj);
                return;
            }
        } catch (Exception e) {
            log.debug(e.toString(), e);
        }
        int ref = out.writeObjectBegin(cl.getName());
        if (ref < -1) {
            // Hessian 1.1 uses a map
            for (int i = 0; i < _methods.length; i++) {
                Method method = _methods[i];
                Object value = null;
                try {
                    value = _methods[i].invoke(obj, (Object[]) null);
                } catch (Exception e) {
                    log.debug(e.toString(), e);
                }
                out.writeString(_names[i]);
                out.writeObject(value);
            }
            out.writeMapEnd();
        } else {
            if (ref == -1) {
                out.writeInt(_names.length);
                for (int i = 0; i < _names.length; i++)
                    out.writeString(_names[i]);
                out.writeObjectBegin(cl.getName());
            }
            for (int i = 0; i < _methods.length; i++) {
                Method method = _methods[i];
                Object value = null;
                try {
                    value = _methods[i].invoke(obj, (Object[]) null);
                } catch (Exception e) {
                    log.debug(e.toString(), e);
                }
                out.writeObject(value);
            }
        }
    }
    /**
     * Finds any matching setter.
     */
    private Method findSetter(Method[] methods, String getterName, Class<?> arg) {
        String setterName = "set" + getterName.substring(3);
        for (int i = 0; i < methods.length; i++) {
            Method method = methods[i];
            if (!method.getName().equals(setterName))
                continue;
            if (!method.getReturnType().equals(void.class))
                continue;
            Class<?>[] params = method.getParameterTypes();
            if (params.length == 1 && params[0].equals(arg))
                return method;
        }
        return null;
    }
    static class MethodNameCmp implements Comparator<Method> {
        public int compare(Method a, Method b) {
            return a.getName().compareTo(b.getName());
        }
    }
}
